Roll polishing apparatus



Oct. 29, 1935. w. w. LEAcI-I ROLL POLISHING APPARATUS Filed Feb. 13, 1934- 3 Sheets-Sheet l INVENTOR.

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Oct. 29, 1935. W W, EACH ROLL POLISHING APPARATUS Filed Feb. 13. 1934 5 Sheets-Sheet 2 INVENTOR.

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oct. 29, 1935. 4W w, EACH 2,018,729

ROLL POLI SHI NG APPARATUS Filed Feb. 15. 1934 3 Sheets--Sheecl 3,

INVNTOR. W///afzz Wleac @dg/7 M19 PW A TToRNEY;

Patented Oct. 29, 1935 UNITE STTES TENT orricl:

ROLL POLISHING APPARATUS Application February 13, 1934, Serial No. 711,018

8 Claims.

'I'he object of my invention herein described is to provide a device by which the upper roll of a mill, such as a two-high sheet mill, may be polished continuously, or intermittently, during the operation of the mill. Said invention is amodification of my oo-pending application No. 684,695, and this application is a continuation in part of my said application No. 684,695 and my co-pending application No. 282,579, on which Patent No. 1,977,001 issued. The device is adapted to be used in conjunction with a polisher fo-r the lower roll, such as is shown in said Patent No. 1,977,001 and to be driven therefrom. As explained in my said application No. 684,695, the

l5 polishing of the lower or driven roll is more important than the polishing of the upper roll, but it is often desired that both rolls should be polished to secure maximum results in rolling.

In the accompanying drawings:

Fig. 1 is an end view of a two-high mill, with a lower roll polisher, equipped with a top roll polisher as described herein mounted to polish the upper front surface of the upper roll; Fig. 2 is an elevational view of the polishers mounted as in Fig. l showing the relation between the two polishers, the mill proper being shown in phantom; Fig. 3 is a View of the upper polisher assembled for mounting in a mill, being partly in elevation and partly in cross-section; Fig. 4 is a cross section of the head of the polisher showing the relation of screw shaft, the internally threaded tubular element for driving the shaft, the sprocket wheel and slip clutch; Fig. 5 is a detail drawing of the inner end of the shaft showing its relation to the tubular housing.

My device may be mounted to polish the upper part of the front face of the upper roll, or may be used to polish the lower part of said roll on the opposite side of the mill. When used in the position first stated, the device is removably mounted on the inside faces of the windows in the mill housing as shown in Figs. 1 and 2. For this purpose angle irons I are mounted on said faces forming ledges upon which the polishing device rests. For purposes of adjustment, as when using a larger roll, liners are placed on said ledge raising the polisher to the desired position. 'Ihe device is further held in operative position by the pull of the tension means hereinafter described.

The polisher comprises a tubular housing 2 through which a screw shaft 3 is mounted as hereinafter described. Mounted on one end of said shaft and within said tubular housing is a bushing 5 which carries a boss 6 projecting through a slot 'I in said housing, which slot is of (Gis1- 253) sucient length to permit said boss to travel back and forth the entire length of the face of the roll to be polished.

Mounted on said boss 6, by set screws which pass through said boss and engage recessed holes 5 in said shaft, is a stone holder bracket 9 which carries on its free end a polishing stone holder I0, so positioned that a polishing element mounted therein will bear against the face of the roll to be polished. Fixedly mounted on said tubular 10 housing at either end of said slot 1 are two collars I2 carrying projecting levers I3. Mounted on, and connecting, said two levers is a bar I4 having a Z cross section to give it rigidity.

In the back of the stone holder are mounted two l5 rollers which bear closely against one face of said Z bar. The shaft 3, bushing 5, boss 6, bracket 9, and stone holder Ill are in an assembly in `iixed relation. A xed relation also exists between the tubular housing 2, the collars I2, levers I3 and 20 the Z bar I4 in another assembly. The bushing 5 is mounted as stated on the end of the shaft 3, and is moved therewith as the shaft is moved longitudinally of the housing. This movement is the only possible relative movement between the 25 two assemblies, as the stone holder isso positioned that it travels along one face ofthe Z bar against which it is pressed as the polishing stone carried thereon is pressed against the face of a roll. l 30 For the purpose of applying pressure to force the polishing element against the roll to be polished, two collars I1 carrying fixed levers I8 are non-rotatably mounted, one toward each end of the tubular housing 2 just outside the mill hous- 35 ings. To these levers spiral springs I 9 are attached, which springs are put under tension by means of chains 20 which may be adjustably secured in forked anchors 2l, mounted on the outside of the mill housings. Tension on said 40 springs causes the two assemblies above described to tend to move about the axis of said shaft, and the polishing element carried on stone holder I0 is pressed rmly against the face of the roll to be polished. 45 The invention is adapted as stated to be used with a polisher for a lower roll as shown in Fig. l. A lower roll polisher suitable for use in such combination is shown in said Fig. land is the subject of invention in my Patent No. 1,977,001 50 which issued on my application No. 282,579.00- pending herewith. In such a lower roll polisher an abrasive stone carrier 5I is moved reciprocally across the working face of the lower roll by a ly connected by a link 54 to a pin 55 in the wobble of a roll. A double acting ratchet is used, with means responsive to movement of the carrier adapted to shift said ratchet, whereby a reversing movement is given said screw reciprocating the carrier across the face of the roll.

Power to shift the shaft 3 and the attached bushing 5 within said housing 2 and force the stone holder I0 forward and back across the face of the roll is provided through a sprocket wheel 22 and a sprocket chain 23, driven by a sprocket wheel mounted on the screw shaft of the lower roll polisher. This sprocket wheel 22 is provided with the number of teeth needed to give the desired speed of rotation, and is mounted as next to be described. On one end of the tubular housing 2 beyond the mill housings, a collar 24 is flxedly mounted by the set screws 25. A curved arml 26 extends from said collar beyond the end oi.' said tube housing for a purpose soon to be explained. Inside the said collar with outside end iiush with the face thereof isa bushing 21 in abutting relation with the end of tubular housing within said collar. Within said bushing and in like relation with the end of said tubular housing is inserted the end of a tubular element 28 internally threaded to engage a thread cut on said shaft 3. For the purpose of cooperating with said threaded element said shaft 3 is threaded from the exterior end inwardly a distance slightly greater than the maximum distance. to be traveled by the abrasive carrier mounted on the inner end thereof. Against the face of the collar and the bushing 21 is a thrust washer 29. A hub member 30 has a collar portion 3| in engagement with said thrust washer and a tubular portion 32 keyed to threaded element 28 by a longitudinal key 33 and a transverse key 34. The said sprocket wheel 22 is rotatably mounted on the tubular portion 32 of said hub 30 with a ber disc 35 between the sprocket wheel and the collar portion of said hub. Mounted on said hub beyond said sprocket wheel and separated therefrom by a second bre disc 36, are the component parts of a slip clutch 31. Such a clutch is well understood and need not be here described. One suitable for use in this connection is described in my copending application No. 684,695. The several parts just described are held in operative relationship with each other and against the said collar 24 by a plate 38 attached to the arm 26, hereinbefore referred to, by the bolts 39. An aperture 40 in this plate permits said shaft 3 to issue therethrough in use. A collar-like portion 4| on said plate surrounds said aperture and is externally threaded that a protective tube may be mounted thereon to cover said threaded shaft when it is in projected position.

In operation a sprocket chain 23 from the lower roll drives the sprocket wheel 22 mounted on the end of the upper roll polisher assembly as described. The compressive elements of the friction clutch are so adjusted that the threaded element 28 is rotated and through its engagement with the screw threads on shaft 3 the latter is shifted back and forth in the tubular hous- Y for the lower polisher reverses, to carry the lower roll polisher back across the face of the lower roll, the movement of thesprocket chain driving' the upper roll polisher will also reverse.

Should the bushing, and polisher mounted thereon, in the upper roll polisher reach one end off the slot before the lower roll polisher reverses, the action of the slip clutch will permit movement of the sprocket chain to continue in the 5 same direction until movement of the lower roll*- polisher is completed and movement reversed,- even though the bushing, having arrived at the end of the slot in the upper roll polisher, may not further move until movement is reversed. 10 By this means inequalities of movement between the polishers on the lower and on the upper roll are automatically adjusted, and the upper roll is fully polished synchronous with the full polishing of the lower roll. 15

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equiv- 2o aient of such stated means be employed.

I therefore particularly point out and distinctly claim as my invention:

l. In a roll polisher for a. sheet mill or the like, in combination, in association with a roll, an 25 element having a spiral thread and a member adapted to operatively engage said thread, a car-r rier for an abrasive, means adapted to support and reciprocate said carrier across the face of the associated roll responsive to relative move- 30 ment between said element and member, means driven from the wobble of a roll and including a ratchet, adapted to produce reversing relative movement between said element and member, and in association with a second roll, a second ele- 35 ment having a spiral thread and a second member adapted to operatively engage said thread, a second carrier for an abrasive, means adapted to support and reciprocate said carrier across the face of the associated roll responsive to relative 40 movement between said second thread bearing element and the said member in engagement therewith, means driven by said first-named driven means, adapted to produce reversing relative movement between said second lthread carry- 45' ing element and the said member engaging same, means adapted to limit the movement of said second carrier, and means adapted to render inoperative said last-named driven means when said second carrier has reached a pre-determined po- 50 sition.

2. In a roll polisher for a sheet mill or the like, in combination, in association with a roll a screwshaft and a screw-nut mounted thereon, a carrier for an abrasive means adapted to support 55 and reciprocate said carrier across the face of the associated roll responsive to relative movement between said shaft and said nut, means, driven from the wobble of a roll and including a ratchet, adapted to produce reversing relative 50 movement between said sha-ft and said nut, in association with another roll a second screw-shaft and a screw-nut mounted thereon, a second carrier for an abrasive, means adapted to support and reciprocate said carrier across the face of the 65 associated roll responsive to relative movement between said second shaft and nut, means, driven by the said first named screw-shaft, adapted to produce reversing relative movement between said second named screw-shaft and the screw-nut' 70 mounted thereon, said last named means including a slip clutch, and means adapted to limit the movement of said last named carrier.

3. In a roll polisher for a sheet mill or the like, in combination, a screw-shaftV and a screw-nut mounted thereon, a carrier for an abrasive, means adapted to support and reciprocate said carrier across the working face of a roll responsive to relative movement between said shaft and said nut, power means adapted to produce relative reversing movement between said shaft and said nut, means adapted to limit the movement of said carrier, and means independent of the reversal of said power means adapted to render said power means inoperative when said carrier has reached a predetermined position.

4. In a. roll polisher for a sheet mill or the like, in combination, a tubular housing supported on -the housings of the mill parallel to, and having a. longitudinal slot the length of a roll surface to be polished, a shaft within said tubular housing, a lug iixedly mounted on said shaft and engaging said slot, a carrier, adapted to carry an abrasive, mounted on said lug, a screw thread on said shaft, a cylindrical member, internally threaded to engage said screw thread, rotatably mounted on said shaft, a hub comprising a tubular portion and a flange portion keyed on said cylindrical member, a sprocket Wheel rotatably mounted on said hub, and a slip clutch adapted to force said sprocket wheel against the flanged portion of said hub.

5. In a polisher for a roll in a sheet mill or the like, in combination, a tubular housing having a longitudinal slot therein, a shaft within the housing, a carrier assembly iixedly mounted on said shaft and including an element which passes through said slot, said assembly being adapted to hold an abrasive against the face of a roll, a screw-thread cut on said shaft, a cylindrical member internally threaded mounted upon said screw-thread, a hub having a tubular portion and a flange portion mounted on said member in fixed relation, a sprocket wheel revolvably mounted on said hub, a slip-clutch mounted on said hub and adapted to force said sprocket wheel into face to face engagement with the flange on said hub.

6. In an automatic polisher for a roll of a mill as described, in combination, a supporting member removably and adjustably mounted parallel to a roll, an abrasive carrying element mounted on said member, means concentric with said member adapted to move said element reciprocally 5 across the working face of such roll, and means adapted to rotate said element about the axis of said reciprocating means, resiliently hold said element in operative position, and hold the combination in operative position relative to such roll.

7. In an automatic polisher for a roll of a mill, in combination, a carrier for an abrasive adapted for reciprocation across the face of a roll, a screw shaft, a nut mounted on said shaft, means adapted to produce rotative movement between said shaft and said nut, which means include a slip clutch, and means adapted to reciprocate said carrier rel sponsive to longitudinal change of relation between said shaft and said nut caused by said rotative movement.

8. In an automatic polisher for a roll of a mill, in combination, a supporting member, removably and adjustably mounted parallel to the face of a roll, which member comprises a screw housing having a longitudinal slot and a bar mounted on said housing in spaced parallel relation, a screw shaft mounted within said housing, a nut mounted on said screw, an abrasive carrier mounted on said housing and having a bearing relation with said bar, means adapted to produce rotative movement between said shaft and said nut, means adapted to reciprocate said carrier on said housing responsive to longitudinal change of relation between said screw and said nut responsive to rotative movement therebetween, and means adapted to hold said combination in operative position relative to said roll and to rotate said supporting member and carrier about the longitudinal axis of said shaft to bring an abrasive carried thereby into operative relation with the face of a roll.

WILLIAM W. LEACH, 

